Charging my Car Battery with Lap top AC Adapter.
I have not used my car for the last 3 weeks and the cold weather makes even worse. Hence, the battery is flat and the voltage across terminal reads 11.3V. I butchered my old laptop AC adapter to make my own home made car battery charger. It is supposed to provide (as per label) 15V and 4A output. However, When I connected up to the car battery (the batter still connected in the car) the voltage drops to 14.3V and the current drown is 0.32 A. Can someone tell me why please? Does this mean that battery is partially charged not completely flat and only draws the needed current? If so how long does it need to charge a 70AH battery
I also I connected the above (my home made car battery charger) to an old car battery (60 AH) I have in the garage (3 years old) and the voltage reads the same (14.3V) but the drawn current is 1.7A and I can hear some chemical reaction nose happing in side the battery..
I have not used my car for the last 3 weeks and the cold weather makes even worse. Hence, the battery is flat and the voltage across terminal reads 11.3V. I butchered my old laptop AC adapter to make my own home made car battery charger. It is supposed to provide (as per label) 15V and 4A output. However, When I connected up to the car battery (the batter still connected in the car) the voltage drops to 14.3V and the current drown is 0.32 A. Can someone tell me why please? Does this mean that battery is partially charged not completely flat and only draws the needed current? If so how long does it need to charge a 70AH battery
I also I connected the above (my home made car battery charger) to an old car battery (60 AH) I have in the garage (3 years old) and the voltage reads the same (14.3V) but the drawn current is 1.7A and I can hear some chemical reaction nose happing in side the battery..